Why is the R.U.L of refractory materials a key indicator?

The actual temperature that the refractory product can withstand is slightly higher than the load softening temperature, mainly for two reasons. First, in actual use, the load on the refractory product is generally lower than the load during the measurement; the second is the masonry in metallurgy. The refractory bricks in the furnace are only heated on one side.
Since the temperature experienced in actual use is higher than the load softening temperature, higher requirements are imposed on the refractory products. The softening temperature of the refractory product depends mainly on its chemical mineral composition and microstructure. The crystalline phase forms a network backbone, and the load softening temperature of the material is high. If the structure is dispersed in the liquid phase in an island shape, the load softening temperature is determined by the content of the liquid phase and its viscosity. For example, the more the liquid phase or the smaller the viscosity, the lower the load softening temperature. The interaction of both the crystalline phase and the liquid phase also changes the amount and nature of the liquid phase. The degree of compactness of the product also has a certain influence on the softening temperature of the load. The commonly used magnesium brick phase composition, mainly periclase crystals, is bonded together by the combination, so the load softening temperature of the magnesium brick depends on the nature of the combination. The combination of magnesia bricks is generally a low-melting silicate phase such as calcium forsterite and magnesium rosewood. Due to the melting point phase of the periclase crystal, the viscosity at low temperature is low, and the magnesia brick exhibits a low load softening temperature. This is where the magnesia fire bricks need to be tackled.
Changxing refractory provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products.
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Construction procedures for refractory brick masonry

(1) Construction procedure of dynamic furnace

1. Dynamic furnace kiln masonry must be carried out after the single-machine no-load test operation of the kiln is qualified.

2. The basic procedures for masonry are:
The starting point should be selected from the hot end to the cold end or from the low end to the high end. The working point should be cleaned and lined to select fire bricks. According to the hot and cold section, different materials of refractory fire bricks should be used. If the qualified bricks are used, there are anchor bolts or bricks. The board, that is, the welding of the anchor nail or the brick board, if there is a heat insulation layer (such as calcium silicate board, etc.), it is necessary to first prepare and install the heat insulation layer, and the mortar mud should match the refractory brick to build the brick expansion gap. Reserved and filled.

(2) Construction procedures for static kiln

The starting point is selected (generally from bottom to top, from the hot end to the cold end). The line is drawn (usually based on the lowest end of the tuyere or inspection port). Fire bricks are selected according to different parts of the equipment. According to the drawings, if the anchoring nails and the supporting bricks are welded, if there is a thermal insulation layer, the installation of the insulating layer should be prepared and used. The material of the mortar should be matched with the refractory bricks to build the arch and lock the bricks , remove the reserve and filling of the expansion joint of the arch tire.

Changxing refractory provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products.

Article Source: Construction procedures for refractory brick masonry
Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
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How to choose insulating bricks

Insulating bricks used in thermal equipment can greatly reduce heat loss and furnace weight and increase thermal efficiency and labor productivity.
For most thermal equipment, to save energy and improve working conditions, insulation is necessary. However, insulation for certain equipment is not necessary because of the advantages and disadvantages of insulation. Therefore, in the actual situation and the performance of the insulation brick should be considered when selecting suitable insulation bricks.

The principles for selecting insulation bricks include:

1.It should not affect the service life of the entire refractory masonry;

2.For high-temperature furnaces that work continuously, general large-area insulation is reasonable and can reduce heat loss. However, for some special areas, such as open hearth roofs, insulation can reduce the service life. For periodic working furnaces, regenerative heat loss is a major factor in heat loss. Insulation can increase the temperature of the masonry and increase the heat of regeneration. Therefore, it is determined whether the regular working furnace should be insulated after calculating the heat storage and heat loss.

3.Because insulating bricks have high porosity, they cannot withstand excessive loads and should not be in direct contact with molten metal, slag and high temperature dust.

4.Insulation bricks have low strength. Brick joints and expansion joints should be properly disposed to avoid damage due to volume expansion. Insulating refractory fire bricks should not be subject to strong mechanical vibration, shock and friction;

5.Since the insulating brick has a large reheat linear contraction, the maximum working temperature should be less than 100℃?than the firing temperature.
Changxing refractory provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products.

Article Source:How to choose insulating bricks
Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd
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Common problems that arise during the use of ladle

(1) It is often encountered to replace the ladle caused by argon blowing. Replacing the ladle will not only delay the smelting time, but also the process of replacing the ladle will bring safety problems, and it will cause the molten steel to take in air and bring in some inclusions during the process of changing the ladle. Inclusions increase the difficulty of smelting and increase the cost of smelting.

(2) The slag line is seriously eroded, and the slag line usage rate is low. Frequent replacement of the slag line will increase smelting costs, and it is also not conducive to the normal operation of smelting, prone to leakage of molten steel, which brings certain hidden dangers to production.

(3)The ladle brick is short in service life and needs to be replaced frequently.

Changxing refractory provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products.

Article Source:Common problems that arise during the use of ladle
Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd
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